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Discontinued Operations, Assets Held for Sale and Divestitures Narrative (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Dec. 31, 2017 | Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2017 | Dec. 04, 2017 | Jan. 06, 2017
Disposal Group, Including Discontinued Operation, Consideration |  |  |  |  |  | $ 305.7
Gain (Loss) on Disposition of Property Plant Equipment | $ 9.0 | $ 2.5 | $ 9.0 | $ 0.0 |  |
Cash [Member] |  |  |  |  |  |
Disposal Group, Including Discontinued Operation, Consideration |  |  |  |  | $ 7.4 |
Prepaid Expenses and Other Current Assets [Member] |  |  |  |  |  |
Disposal Group, Including Discontinued Operation, Prepaid and Other Assets |  |  |  |  | 0.8 |
Property, Plant and Equipment [Member] |  |  |  |  |  |
Disposal Group, Including Discontinued Operation, Property, Plant and Equipment |  |  |  |  | 0.4 |
Environmental Remediation [Member] |  |  |  |  |  |
Disposal Group, Including Discontinued Operation, Consideration |  |  |  |  | $ 1.2 |

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